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Marvel Cinematic Universe

In the Marvel Cinematic Universe, HYDRA made their first appearance in Captain America: The First Avenger as major antagonists in this film together with the film's main antagonist Red Skull, their leader and the founder of HYDRA.

HYDRA returned as antagonists in the sequel of The First Avenger which is Captain America: The Winter Soldier and they hide inside SHIELD Agency where they are led by their high-ranking member Alexander Pierce, the primary antagonist, and he and HYDRA used the Winter Soldier as senior henchman and as agent.